| Patent Number |
Title Of Patent |
Date Issued |
| 7394878 |
Digital frequency determining apparatus and methods using matched filters |
July 1, 2008 |
| Methods and apparatus for determining a dominant frequency contained in a multi-frequency analog signal. An apparatus includes a first matched filter pair and a second a second matched filter pair. Both the first matched filter pair and the second matched filter pair are configured to |
| 7233791 |
Cell phone feature for downloading information via a telecommunications network |
June 19, 2007 |
| The present invention permits safeguarding of private data entered into a memory chip of a cell phone by permitting the cell phone owner to erase the data in a lost or stolen phone, using an preset erase code and erase command in the cell phone or the network base station, and disabling |
| 7132778 |
Surface acoustic wave modulator |
November 7, 2006 |
| An acoustic wave identification transponder device, having a substrate, an electroacoustic transfer generating an acoustic wave in said substrate and a set of encoding elements disposed in a path of the acoustic wave for modifying the acoustic wave, having elements which reflect portions |
| 7054624 |
Safeguarding user data stored in mobile communications devices |
May 30, 2006 |
| The present invention permits safeguarding of private data entered into a memory chip of a cell phone by permitting the cell phone owner to erase the data in a lost or stolen phone, using an preset erase code and erase command in the cell phone or the network base station, and disabling |
| 7023323 |
Frequency hopping spread spectrum passive acoustic wave identification device |
April 4, 2006 |
| A system and method for interrogating a passive acoustic transponder, producing a transponder signal having characteristic set of signal perturbations in response to an interrogation signal, comprising a signal generator, producing an interrogation signal having a plurality of differ |
| 6995654 |
Apparatus and method for locating a tagged item |
February 7, 2006 |
| An apparatus and method for determining the location of an item from a plurality of like items, using matching paging devices and passive transponder tags on each item. The unique code number (IC) of the tag is programmed into its matching paging device. The paging device operates re |
| 6950009 |
Dual mode transmitter/receiver and decoder for RF transponder units |
September 27, 2005 |
| An enhanced backscatter RF-ID tag reader system and multiprotocol RF tag reader system is provided. In a multiprotocol mode, the system emits a non-stationary interrogation signal, and decodes a phase modulated backscatter signal by detecting a stronger phase component from quadrature |
| 6775616 |
Environmental location system |
August 10, 2004 |
| A system and method for determining a location. The system employs encoded information devices dispersed through the environment, each having a non-unique code associated therewith. The codes from the encoded information devices are acquired as a reading device passes nearby, and sto |
| 6633226 |
Frequency hopping spread spectrum passive acoustic wave identification device |
October 14, 2003 |
| A system and method for interrogating a passive acoustic transponder, producing a transponder signal having characteristic set of signal perturbations in response to an interrogation signal, comprising a signal generator, producing an interrogation signal having a plurality of differ |
| 6611758 |
Environmental location system |
August 26, 2003 |
| A system and method for determining a location. The system employs encoded information devices dispersed through the environment, each having, a non-unique code associated therewith. The codes from the encoded information devices are acquired as a reading device passes nearby, and st |
| 6611224 |
Backscatter transponder interrogation device |
August 26, 2003 |
| A backscatter transponder interrogator, comprising a transmitter, emitting an interrogation signal for interacting with a backscatter transponder within an interrogation field, a plurality of antennas, each having a different and complementary property, such that a backscatter response |
| 6580358 |
Dual mode transmitter-receiver and decoder for RF transponder tags |
June 17, 2003 |
| An enhanced backscatter RF-ID tag reader system and multiprotocol RF tag reader system is provided. In a multiprotocol mode, the system emits a non-stationary interrogation signal, and decodes a phase modulated backscatter signal by detecting a stronger phase component from quadrature |
| 6531957 |
Dual mode transmitter-receiver and decoder for RF transponder tags |
March 11, 2003 |
| An enhanced backscatter RF-ID tag reader system and multiprotocol RF tag reader system is provided. In a multiprotocol mode, the system emits a non-stationary interrogation signal, and decodes a phase modulated backscatter signal by detecting a stronger phase component from quadrature |
| 6433671 |
Dual mode transmitter-receiver and decoder for RF transponder tags |
August 13, 2002 |
| An enhanced backscatter RF-ID tag reader system and multiprotocol RF tag reader system is provided. In a multiprotocol mode, the system emits a non-stationary interrogation signal, and decodes a phase modulated backscatter signal by detecting a stronger phase component from quadrature |
| 6424916 |
Environmental location system |
July 23, 2002 |
| A system and method for determining a location. The system employs encoded information devices dispersed through the environment, each having a non-unique code associated therewith. The codes from the encoded information devices are acquired as a reading device passes nearby, and sto |
| 6388360 |
Surface acoustic wave transponder configuration |
May 14, 2002 |
| An acoustic wave identification transponder device, having a substrate, an electroacoustic transducer generating an acoustic wave in said substrate and a set of encoding elements disposed in a path of the acoustic wave for modifying the acoustic wave, having elements which reflect portio |
| 6259991 |
Environmental location system |
July 10, 2001 |
| A system and method for determining a location. The system employs encoded information devices dispersed through the environment, each having a non-unique code associated therewith. The codes from the encoded information devices are acquired as a reading device passes nearby, and sto |
| 6208062 |
Surface acoustic wave transponder configuration |
March 27, 2001 |
| An acoustic wave identification transponder device, having a substrate, an electroacoustic transducer generating an acoustic wave in said substrate and a set of encoding elements disposed in a path of the acoustic wave for modifying the acoustic wave, having elements which reflect portio |
| 6114971 |
Frequency hopping spread spectrum passive acoustic wave identification device |
September 5, 2000 |
| A system and method for interrogating a passive acoustic transponder, producing a transponder signal having characteristic set of signal perturbations in response to an interrogation signal, comprising a signal generator, producing an interrogation signal having a plurality of differ |
| 6107910 |
Dual mode transmitter/receiver and decoder for RF transponder tags |
August 22, 2000 |
| An enhanced backscatter RF-ID tag reader system and multiprotocol RF tag reader system is provided. In a multiprotocol mode, the system emits a non-stationary interrogation signal, and decodes a phase modulated backscatter signal by detecting a stronger phase component from quadrature |
| 6060815 |
Frequency mixing passive transponder |
May 9, 2000 |
| A transponder device, receiving a plurality of waves having differing frequencies, and producing a wave, having a frequency differing from the plurality of received waves, having characteristic modifications, having a mixer, receiving at least two waves and producing a mixed wave having |
| 5986382 |
Surface acoustic wave transponder configuration |
November 16, 1999 |
| An acoustic wave identification transponder device, having a substrate, an electroacoustic transducer generating an acoustic wave in said substrate and a set of encoding elements disposed in a path of the acoustic wave for modifying the acoustic wave, having at least two reflective eleme |
| 5955949 |
Layered structure for a transponder tag |
September 21, 1999 |
| A transponder antenna is carried by a substrate and is sandwiched between the substrate and a cover sheet. A rectangular opening extends through the cover sheet and receives a signal processing chip adhesively carried in a recess below a cap which covers the opening. The chip is spaced w |
| 5654693 |
Layered structure for a transponder tag |
August 5, 1997 |
| A transponder antenna is carried by a substrate and is sandwiched between the substrate and a cover sheet. A rectangular opening extends through the cover sheet and receives a signal processing chip adhesively carried in a recess below a cap which covers the opening. The chip is spaced w |
| 5182570 |
End fed flat antenna |
January 26, 1993 |
| A planar dipole antenna is arranged on a non-conductive substrate having an exposed, planar surface. The antenna includes a first quarter wavelength element having a first end and an opposite second end and a second quarter wavelength element having a third end and an opposite fourth end |
| 5095240 |
Inductively coupled SAW device and method for making the same |
March 10, 1992 |
| An apparatus for coupling energy into and out of a SAW device which can serve as a transponder in a "passive interrogator label system". The device includes a conductive loop deposited on the active surface of the piezoelectric substrate which is electrically connected at its ends to the |
| 4951057 |
Inductive input/output coupling for a surface acoustic wave device |
August 21, 1990 |
| A transponder for use in an interrogator/transponder system includes a piezoelectric substrate for coupling electrical energy into and/or out of a surface acoustic wave (SAW) device; a first inductive loop inductively coupled to a conductive loop on the substrate, a second inductive loop |
| 4737790 |
Passive interrogator label system with a surface acoustic wave transponder operating at its thir |
April 12, 1988 |
| A "passive interrogator label system" (PILS) is disclosed with passive, SAW transponders which are capable of receiving an interrogation signal, processing this signal and transmitting a reply signal that is derived from the interrogation signal and contains encoded information. The SAW |
| 4737789 |
Inductive antenna coupling for a surface acoustic wave transponder |
April 12, 1988 |
| An arrangement is disclosed for coupling electrical energy into and/or out of a surface acoustic wave (SAW) device, such as a transponder. The SAW device has two input/output terminals electrically connected to at least one transducer for converting between electrical energy and SAW ener |
| 4734698 |
Passive interrogator label system having offset compensation and temperature compensation for a |
March 29, 1988 |
| A passive interrogator label system is disclosed which transmits a first signal to, and receives a second signal from a remote, encoding transponder. In the preferred embodiment, the transponder is a passive, surface acoustic wave device which receives the first signal, processes thi |
| 4725841 |
System for interrogating a passive transponder carrying phase-encoded information |
February 16, 1988 |
| A "passive interrogator label system" (PILS) comprises an interrogator for transmitting an interrogation signal, one or more "labels" or passive transponders which produce a reply signal containing coded information in response to the interrogation signal, and a receiver and decoder for |
| 4724443 |
Patch antenna with a strip line feed element |
February 9, 1988 |
| A patch-type antenna is disclosed for radiating electromagnetic radiation in the microwave band. The antenna comprises first and second electrically conductive plates which are supported in spaced-apart parallel relationship. The first plate serves as a ground plane, whereas the second |
| 4703327 |
Interrogator/receiver system for use with a remote transponder |
October 27, 1987 |
| Interrogator/receiver apparatus is disclosed for transmitting a first signal to, and receiving a second signal from a remote transponder. In the preferred embodiment, the transponder is a passive, surface acoustic wave device which receives the first signal, processes this signal and |
| 4625208 |
Surface acoustic wave passive transponder having acoustic wave reflectors |
November 25, 1986 |
| A passive transponder for use in an interrogation/transponder system comprises a substrate having a substrate surface defining a path of travel for surface acoustic waves; at least one transducer element arranged on the surface for converting between electrical energy and surface acousti |
| 4625207 |
Surface acoustic wave passive transponder having amplitude and phase-modifying surface pads |
November 25, 1986 |
| A passive transponder for use in an interrogation/transponder system comprises a substrate having a substrate surface defining a path of travel for surface acoustic waves; a launch transducer element arranged on the surface for converting interrogating signals into surface acoustic waves |
| 4623890 |
Apparatus for compensating non-linearities in frequency-modulated signal |
November 18, 1986 |
| A "passive interrogator label system" (PILS) comprises an interrogator for transmitting an interrogation signal, one or more "labels" or passive transponders which produce a reply signal containing coded information in response to the interrogation signal, and a receiver and decoder for |
| 4605929 |
Surface acoustic wave passive transponder having optimally-sized transducers |
August 12, 1986 |
| A passive transponder for use in an interrogation/transponder system comprises a substrate having a substrate surface defining a path of travel for surface acoustic waves; a launch transducer element arranged on the surface for converting interrogating signals into surface acoustic waves |
| 4604623 |
Surface acoustic wave passive transponder having non-reflective transducers and pads |
August 5, 1986 |
| A passive transponder for use in an interrogation/transponder system comprises a substrate having a substrate surface defining a path of travel for surface acoustic waves; a launch transducer element arranged on the surface for converting interrogating signals into surface acoustic waves |
